On an Ubuntu Server, one can install a GUI desktop using tasksel.  Following instruction on this [[https://linuxconfig.org/ubuntu-20-04-gui-installation|site]].

To change desktop, edit the startwm.sh and add the desktop name at the bottom.
<code>
 sudo nano /etc/xrdp/startwm.sh
</code>

The different desktop name can be found in:

[[https://askubuntu.com/questions/135483/how-to-configure-xrdp-to-start-cinnamon-as-default-desktop-session]]